libssl: Load only the ciphers and digests needed for TLS, not all of them

[rgacogne]

Short description

OPENSSL_init_crypto(), added in 1.1.0, loads all available ciphers and digests by default. Since we only need the TLS-related ones, that only increases the startup time and the memory usage.

Before:

OPENSSL_INIT: ossl_init_base: Setting up stop handlers
OPENSSL_INIT: ossl_init_register_atexit()
OPENSSL_INIT: ossl_init_load_crypto_nodelete()
OPENSSL_INIT: openssl_config_int((null), (null), 50)
OPENSSL_INIT: ossl_init_engine_rdrand: engine_load_rdrand_int()
OPENSSL_INIT: ossl_init_thread_start: marking thread for err_state
OPENSSL_INIT: ossl_init_load_crypto_strings: err_load_crypto_strings_int()
OPENSSL_INIT: ossl_init_engine_dynamic: engine_load_dynamic_int()
OPENSSL_INIT: ossl_init_add_all_ciphers: openssl_add_all_ciphers_int()
OPENSSL_INIT: ossl_init_add_all_digests: openssl_add_all_digests()
OPENSSL_INIT: ossl_init_ssl_base: Adding SSL ciphers and digests
OPENSSL_INIT: ossl_init_ssl_base: SSL_COMP_get_compression_methods()
OPENSSL_INIT: ossl_init_ssl_base: SSL_add_ssl_module()
OPENSSL_INIT: ossl_init_load_ssl_strings: ERR_load_SSL_strings()
OPENSSL_INIT: ossl_init_thread_start: marking thread for rand
OPENSSL_INIT: ossl_init_thread_start: marking thread for rand

After:

OPENSSL_INIT: ossl_init_base: Setting up stop handlers
OPENSSL_INIT: ossl_init_register_atexit()
OPENSSL_INIT: ossl_init_load_crypto_nodelete()
OPENSSL_INIT: openssl_config_int((null), (null), 50)
OPENSSL_INIT: ossl_init_engine_rdrand: engine_load_rdrand_int()
OPENSSL_INIT: ossl_init_thread_start: marking thread for err_state
OPENSSL_INIT: ossl_init_load_crypto_strings: err_load_crypto_strings_int()
OPENSSL_INIT: ossl_init_engine_dynamic: engine_load_dynamic_int()
OPENSSL_INIT: ossl_init_ssl_base: Adding SSL ciphers and digests
OPENSSL_INIT: ossl_init_ssl_base: SSL_COMP_get_compression_methods()
OPENSSL_INIT: ossl_init_ssl_base: SSL_add_ssl_module()
OPENSSL_INIT: ossl_init_load_ssl_strings: ERR_load_SSL_strings()
OPENSSL_INIT: ossl_init_thread_start: marking thread for rand
OPENSSL_INIT: ossl_init_thread_start: marking thread for rand

Checklist

I have:

• read the CONTRIBUTING.md document
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)